59Co NMR

Although many studies and models have been proposed for the structure of Co(Ni)/Mo(W) entities that share sulfurs or transfer electrons at or near the surface, the exact picture is still uncertain. This is a result of the difficulty in measuring the dispersion of the layered TMS. All models depend for their proof on this knowledge. 57Co Mossbauer and 59Co NMR... 

The only 59Co NMR study is on Co4(CO)12 and the apparent discrepancy between the results obtained by two independent groups in 1967 104,173 has recently been resolved56. The 59Co NMR spectrum of a solution of Co (CO)12 in hexane at 30 °C shows two peaks at 8,400 and 9,670 p.p.m. to high field of [Co(NH3)6]C13 with relative intensities 1 3 respectively66. This is clearly consistent with the solid state structure (Fig. 4) but is inconsistent with the I3C NMR results66, 92. ... 

The 59Co NMR spectrum of the isoelectronic tetrahedral [Co(PF3)4] anion has also been recorded. 

The reaction of alkynes [RCCR ] (R = R = Ph R = Ph, R = H R = R sH) with the tetrahedral heteronuclear cluster [RuCo3(CO)n(NO)] afforded338 a mixture of the butterfly cluster [RuCo3((X))9(NO)(P4- n -RCCR )], formed via specific insertion of the alkyne into the Co-Co bond, and the trinuclear cluster [RuCo2(CO)9(p3-Ti2-RCCR )]. The tnixture was analysed using 59co-NMR spectroscopy and the X-ray crystal structure of [RuCo3(CO)9(NO)(m- n2-PhCCH)] was determined. 

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